/*
 * Copyright 2011 yingxinwu.g@gmail.com
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package xink.vpn.wrapper;

/**
 * Enumeration of all VPN states. A normal VPN connection lifetime starts in {@link IDLE}. When a new connection is
 * about to be set up, it goes to {@link CONNECTING} and then {@link CONNECTED} if successful; back to {@link IDLE} if
 * failed. When the connection is about to be torn down, it goes to {@link DISCONNECTING} and then {@link IDLE}.
 * {@link CANCELLED} is a state when a VPN connection attempt is aborted, and is in transition to {@link IDLE}. The
 * {@link UNUSABLE} state indicates that the profile is not in a state for connecting due to possibly the integrity of
 * the fields or another profile is connecting etc. The {@link UNKNOWN} state indicates that the profile state is to be
 * determined. {@hide}
 */
public enum VpnState {
    CONNECTING, DISCONNECTING, CANCELLED, CONNECTED, IDLE, UNUSABLE, UNKNOWN;

    /**
     * Whether this's a transitive state
     */
    public boolean isTransitive() {
        return this == CONNECTING || this == DISCONNECTING;
    }

    /**
     * Whether this's a stable state
     */
    public boolean isStable() {
        return this == VpnState.CONNECTED || this == VpnState.IDLE;
    }
}
